What Does It Mean If My Poop Is Black? Melena Guide Black stool? Bright red blood? Each tells a different story. I've explained what these signs indicate and when to seek help. Watch the video, and if you relate to any of these Foods That Cause Dark Stools and When to Be Concerned GoodRx When is stool color concerning? Don't Ignore If Your Stool Color Changes Suddenly Comment POOP and I'll send you the stool guide I use with my patients. Trust your gut. Follow @doctor.sethi for no BS gut science